133463-88-4Relevant academic research and scientific papers
Chiral Alkyl Amine Synthesis via Catalytic Enantioselective Hydroalkylation of Enecarbamates
Qian, Deyun,Bera, Srikrishna,Hu, Xile
supporting information, p. 1959 - 1967 (2021/02/06)
Chiral alkyl amines are omnipresent as bioactive molecules and synthetic intermediates. The catalytic and enantioselective synthesis of alkyl amines from readily accessible precursors is challenging. Here we develop a nickel-catalyzed hydroalkylation method to assemble a wide range of chiral alkyl amines from enecarbamates (N-Cbz-protected enamines) and alkyl halides with high regio- and enantioselectivity. The method works for both nonactivated and activated alkyl halides and is able to produce enantiomerically enriched amines with two minimally differentiated α-alkyl substituents. The mild conditions lead to high functional group tolerance, which is demonstrated in the postproduct functionalization of many natural products and drug molecules, as well as the synthesis of chiral building blocks and key intermediates to bioactive compounds.
Palladium complexes with meso-bioxazoline ligands for alternating styrene/CO copolymerisation: Counterion effect
Sirbu, Doina,Consiglio, Giambattista,Milani, Barbara,Kumar, P.G. Anil,Pregosin, Paul S.,Gischig, Sebastian
, p. 2254 - 2262 (2007/10/03)
Two sets of mono- and dicationic palladium complexes (8) and (10), having CF3SO3-,BF4- and PF6- as counterions, were synthesised. The interionic structure of the methyl-acetonitrile complexes [Pd((R,S)-Bn-Box)(CH3) (NCCH3)](X) (8) in
Enantioselective Cyclopropanation of Allylic Alcohols. The Effect of Zinc Iodide
Denmark, Scott E.,O'Connor, Stephen P.
, p. 3375 - 3389 (2007/10/03)
The effect of zinc iodide on the catalytic, enantioselective cyclopropanation of aliylic alcohols is examined with bis(iodomethyl)zinc as the reagent and bis-methanesulfonamide 7 as the catalyst. Significant rate enhancement was observed when 1 equiv of zinc iodide was present, but more importantly, the enantiomeric excess of the product cyclopropane increased from 80% to 89% for the substrate cinnamyl alcohol. Reaction studies and spectroscopic investigations show that this remarkable influence is the result of reagent modification via a Schlenk equilibrium that produces the more reactive and selective species (iodomethyl)zinc iodide.
C2-Symmetric 4,4',5,5'-Tetrahydrobi(oxazoles) and 4,4',5,5'-Tetrahydro-2,2'-methylenebis as Chiral Ligands for Enantioselective Catalysis
Mueller, Dieter,Umbricht, Gisela,Weber, Beat,Pfaltz, Andreas
, p. 232 - 240 (2007/10/02)
The synthesis of a series of enantiomerically pure, C2-symmetric 4,4',5,5'-tetrahydro-2,2'-methylene-bis and 4,4',5,5'-tetrahydro-2,2'-bi(oxazoles) is reported.Copper complexes with anionic tetrahydromethylenebis ligands are efficient c
